阅读说明：本技术 一种传感器组合式毕托巴流量计 (Sensor combined Pitotbar flowmeter ) 是由 王忠辉 唐力壮 王超 蔡潇 胡瑶 齐丽萍 孙丽民 张旭 于 2019-11-14 设计创作，主要内容包括：本发明公开了一种传感器组合式毕托巴流量计,包括多个毕托巴流量传感器、多个差压变送器和流量积算仪,毕托巴流量传感器具有导压管和相连的取压头,每个毕托巴流量传感器的信号输出端与相对应的差压变送器的信号输入端相连,多个差压变送器的信号输出端分别与所述流量积算仪相对应的信号输入端相连,还包括有传感器安装座,该传感器安装座具有固定相连的上、下连接法兰,下连接法兰的底部连有安装套筒,每个毕托巴流量传感器的导压管密封穿过上连接法兰、且与导压管相连的取压头位于安装套筒的下方,并且这些毕托巴流量传感器取压头下部的全压孔沿竖直方向渐次排列。应用本发明测量管道内的流体流量时可以获得相对准确测量结果。(The invention discloses a sensor combined Pitot flowmeter, which comprises a plurality of Pitot flow sensors, a plurality of differential pressure transmitters and a flow integrating instrument, wherein each Pitot flow sensor is provided with a pressure guide pipe and a pressure taking head connected with the pressure guide pipe, the signal output end of each Pitot flow sensor is connected with the signal input end of the corresponding differential pressure transmitter, the signal output ends of the plurality of differential pressure transmitters are respectively connected with the corresponding signal input ends of the flow integrating instrument, the sensor combined Pitot flowmeter also comprises a sensor mounting seat, the sensor mounting seat is provided with an upper connecting flange and a lower connecting flange which are fixedly connected, the bottom of the lower connecting flange is connected with a mounting sleeve, a pressure guide pipe of each Pitotbar flow sensor penetrates through the upper connecting flange in a sealing manner, a pressure taking head connected with the pressure guide pipe is positioned below the mounting sleeve, and the full pressure holes at the lower part of the pressure taking head of the Pitotbar flow sensor are arranged gradually along the vertical direction. When the invention is applied to measuring the fluid flow in the pipeline, a relatively accurate measurement result can be obtained.)

1. The sensor combined Pitot flowmeter comprises a Pitot flow sensor (10), a differential pressure transmitter (20) and a flow integrating instrument (30), wherein the Pitot flow sensor is provided with a pressure guide pipe (11) and a pressure taking head (12) which is connected with the pressure guide pipe, a full pressure channel (13) and a static pressure channel (14) are arranged in the pressure taking head, the axes of the full pressure channel (13) and the static pressure channel (14) are parallel to each other and are positioned at two opposite sides in the pressure taking head, the two opposite sides of the lower part of the pressure taking head (12) are provided with a full pressure hole (15) and a static pressure hole (16) which are respectively communicated with the full pressure channel (13) and the static pressure channel (14), the signal output end of the Pitot flow sensor (10) is connected with the signal input end of the differential pressure transmitter (20), the signal output end of the differential pressure transmitter (20) is connected with the signal input end of the flow integrating instrument (30), lower flange (41, 42), the bottom of lower flange (42) even has installation sleeve (43), pressure pipe (11) sealed pass upper flange (41), and with the pressure pipe link to each other get pressure head (12) be located the below of installation sleeve (43), its characterized in that: the pressure measuring device is characterized in that the number of the Pittobar flow sensors (10) is multiple, correspondingly, the number of the differential pressure transmitters (20) is also multiple, pressure guide pipes (11) of the Pittobar flow sensors (10) penetrate through the upper connecting flange (41) in a sealing mode, pressure measuring heads (12) connected with the pressure guide pipes of the Pittobar flow sensors (10) are located below the mounting sleeve (43), and full pressure holes (15) in the lower portions of the pressure measuring heads of the Pittobar flow sensors are arranged gradually in the vertical direction; the signal output end of each Pitotbar flow sensor (10) is connected with the signal input end of the corresponding differential pressure transmitter (20), and the signal output ends of the differential pressure transmitters (20) are respectively connected with the signal input ends corresponding to the flow totalizer (30).

2. The sensor combination pitot flowmeter of claim 1, characterized by: the axes of the full pressure channels (13) in the pressure taking heads (12) of the Pitotbar flow sensors (10) are positioned in the same plane, and the axes of the static pressure channels (14) are positioned in another plane.

Technical Field

The invention relates to a Pitot flowmeter, in particular to a sensor combined Pitot flowmeter.

Background

The Pitot flowmeter mainly comprises a Pitot sensor, a differential pressure transmitter and a flow integrating instrument, when in use, the Pitot flow sensor is vertically inserted into a pipeline from the side wall of the pipeline, a full pressure hole of a pressure head of the Pitot flow sensor faces the incoming flow direction of the fluid, a static pressure hole faces the outgoing flow direction of the fluid, when the fluid flows in the pipeline, a full pressure interface and a static pressure interface at the upper end of a pressure guide pipe of the Pitot flow sensor respectively output full pressure and static pressure signals of the fluid flowing in the pipeline, the differential pressure transmitter converts the full pressure and static pressure signals of the fluid in the pipeline transmitted by the Pitot sensor into standard current signals of 4 ~ 20mA and transmits the standard current signals to the flow integrating instrument, and the flow of the fluid in the pipeline can be finally calculated according to the full pressure and static pressure of the fluid flowing in the flow integrating instrument.

When the pitot flowmeter in the prior art measures the fluid flow in a pipeline, the measurement accuracy of the pitot flow sensor determines the measurement accuracy of the fluid flow in the pipeline finally, and if the errors of the full pressure and static pressure signals transmitted by the pressure guide pipe are large, the error of the final measurement result is large. The full pressure or static pressure signal is inaccurate, for example, when scaling, excessive dust accumulation and crystallization occur on the inner wall of a hole in the full pressure or static pressure hole of a pressure sampling head connected with a pressure guiding pipe, the output full pressure or static pressure signal changes greatly, so that the error of the measuring result is large.

Disclosure of Invention

The invention aims to solve the technical problem of providing a sensor combined Pitotbar flowmeter which can obtain a relatively accurate measurement result when measuring the flow rate of fluid in a pipeline.

In order to solve the technical problem, the invention provides a sensor combined Pitot-bar flowmeter, which comprises a Pitot-bar flow sensor, a differential pressure transmitter and a flow integrating instrument, wherein the Pitot-bar flow sensor is provided with a pressure guide pipe and a connected pressure taking head, the pressure taking head is internally provided with a full pressure channel and a static pressure channel which are parallel to each other in axis and are positioned at two opposite sides in the pressure taking head, the two opposite sides at the lower part of the pressure taking head are provided with a full pressure hole and a static pressure hole which are respectively communicated with the full pressure channel and the static pressure channel, the signal output end of the Pitot-bar flow sensor is connected with the signal input end of the differential pressure transmitter, the signal output end of the differential pressure transmitter is connected with the signal input end of the flow integrating instrument, the sensor combined Pitot-bar flowmeter also comprises a sensor mounting seat, the sensor mounting seat is provided with an upper connecting flange and a lower connecting, The pressure taking heads connected with the pressure guide pipes are positioned below the mounting sleeve, the number of the Pitot-bar flow sensors is multiple, correspondingly, the number of the differential pressure transmitters is also multiple, the pressure guide pipes of the Pitot-bar flow sensors penetrate through the upper connecting flange in a sealing manner, the pressure taking heads connected with the pressure guide pipes of the Pitot-bar flow sensors are positioned below the mounting sleeve, and the full pressure holes at the lower parts of the pressure taking heads of the Pitot-bar flow sensors are arranged gradually along the vertical direction; the signal output end of each Pitotbar flow sensor is connected with the signal input end of the corresponding differential pressure transmitter, and the signal output ends of the differential pressure transmitters are respectively connected with the signal input ends corresponding to the flow totalizer.

As an improvement of the invention, the axes of the full pressure channels in the pressure taking heads of the plurality of Pitot flow sensors are positioned in the same plane, and the axes of the static pressure channels are positioned in another plane.

When the sensor combined Pitot-bar flowmeter adopting the structure is used, the Pitot-bar flow sensor is arranged on a measured pipeline by matching the mounting sleeve at the bottom of the sensor mounting seat with the measured pipeline, and the pressure taking head at the bottom of the pressure guide pipe of each Pitot-bar flow sensor is positioned in the measured pipeline. Because the full pressure holes at the lower part of the pressure taking head of the Pitot flow sensors are arranged gradually along the vertical direction, the method is equivalent to measuring the fluid flow in the same pipeline by using a plurality of different Pitot flowmeters, the measurement result is the average value of all the measurement results, the measurement result is relatively accurate, and the measurement precision is higher; when a group of differential pressure signals output by a Pitotbar flow sensor are transmitted to the flow integrating instrument through the corresponding differential pressure transmitter, and the difference value between the integrated flow value of the flow integrating instrument and the average value of all measurement results exceeds a certain range, the integrating instrument can output the average value of other measurement results, and still obtain relatively accurate measurement results. The invention can maintain or replace a Pitotbar flow sensor with larger output measurement result error during the maintenance of the flowmeter.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic view of a partial cross-sectional front view of a sensor combination Pitotbar flowmeter of the present invention.

Fig. 2 is a side view partially in section of fig. 1.

Fig. 3 is an enlarged schematic view of the structure at I in fig. 1.

Fig. 4 is a schematic sectional view taken along line a-a in fig. 3.

Detailed Description

Referring to fig. 1-4, the invention relates to a sensor combined Pitot-bar flowmeter, which comprises a Pitot-bar flow sensor 10, a differential pressure transmitter 20 and a flow integrating instrument 30, wherein the Pitot-bar flow sensor is provided with a pressure guide pipe 11 and a pressure tapping head 12 connected with the pressure guide pipe, a full pressure channel 13 and a static pressure channel 14 are arranged in the pressure tapping head, the axes of the full pressure channel 13 and the static pressure channel 14 are parallel to each other and are positioned at two opposite sides in the pressure tapping head, the two opposite sides at the lower part of the pressure tapping head 12 are provided with a full pressure hole 15 and a static pressure hole 16 which are respectively communicated with the full pressure channel 13 and the static pressure channel 14, the signal output end of the Pitot-bar flow sensor 10 is connected with the signal input end of the differential pressure transmitter 20, the signal output end of the differential pressure transmitter 20 is connected with the signal input end of the flow integrating instrument 30, the sensor mounting seat 40 is also provided with upper and lower connecting, the pressure guide pipes 11 penetrate through the upper connecting flange 41 in a sealing mode, the pressure taking heads 12 connected with the pressure guide pipes are located below the mounting sleeve 43, the number of the Pitot-bar flow sensors 10 is multiple, correspondingly, the number of the differential pressure transmitters 20 is also multiple, the pressure guide pipes 11 of the Pitot-bar flow sensors 10 penetrate through the upper connecting flange 41 in a sealing mode, the pressure taking heads 12 connected with the pressure guide pipes of the Pitot-bar flow sensors 10 are located below the mounting sleeve 43, the full-pressure holes 15 at the lower portions of the pressure taking heads of the Pitot-bar flow sensors are arranged gradually in the vertical direction, the static pressure holes 16 are arranged gradually in the vertical direction correspondingly, namely the full-pressure holes 15 are arranged in the vertical direction, the distances between the adjacent full-pressure holes are equal, and the static pressure holes 16 are arranged in the vertical direction, and the distances between the adjacent static pressure holes are equal; the signal output end of each Pitot-bar flow sensor 10 is connected with the signal input end of the corresponding differential pressure transmitter 20, and the signal output ends of the differential pressure transmitters 20 are respectively connected with the signal input ends corresponding to the flow totalizer 30. The axes of the full pressure channel 13 in the pressure taking head 12 of the plurality of Pitot flow sensors 10 are positioned in the same plane, the axis of the static pressure channel 14 is positioned in another plane, and the axes of the full pressure channel 13 and the static pressure channel 14 in the pressure taking head 12 of each Pitot flow sensor 10 are parallel to each other, so that the two planes are also parallel to each other.

Fig. 1 also shows the structural state of the combined pitot flowmeter of the sensor of the invention when the sensor is mounted on the measured pipeline 1, and the pitot flowmeter of fig. 1 is mounted on the measured pipeline 1 by matching the mounting sleeve 143 at the bottom of the connecting flange below the mounting seat with the pipeline.

The differential pressure between each flowmeter, because of inserting the pipeline in the depth of insertion account for the pipeline proportion different, when the medium flows, because of pipeline central velocity of flow and pipeline edge velocity of flow are different, there is certain proportion in the differential pressure between each positive pressure passageway and the negative pressure passageway, it is that the pipeline internal diameter reduces to scale deposit in the pipeline, insert the change of sensor proportion in the pipeline this moment, the differential pressure between each positive pressure passageway and the negative pressure passageway has certain proportion to change, the relation of differential pressure proportional relation and pipeline scale deposit condition is passed through the record to the integrating instrument, calculate the pipeline scale deposit. Thereby calculating the flow area of the medium and automatically correcting.